The investigation of EPR paramagnetic probe line width and shape temperature dependence in high-temperature superconductors of Bi–Pb–Sr–Ca–Cu–O system

Abstract

The work describes the appearance of magnetic phases in the strongly anisotropic high-temperature superconductor Bi 1.7 Pb 0.3 Sr 2 Ca 2 Cu 3 O 10−δ , in the temperature region where the superconductor is in the normal state, as determined by the EPR line width, H of a paramagnetic probe in its proximity. In the normal state, near 175 K > T c a peak in the temperature dependence of H develops with the characteristic time ∼ 17 min, which indicates the onset of a magnetic phase-domains in this material.